Return Values

eio_readdir() flag. If specified, the result argument of the callback
becomes an array with the following keys:
'names' - array of directory names
'dents' - array of struct
eio_dirent-like arrays having the following keys each:
'name' - the directory name;
'type' - one of EIO_DT_*
constants;
'inode' - the inode number, if available, otherwise
unspecified;

When this flag is specified, then the names will be returned in an order
suitable for stat'ing each one. When planning to
stat() all files in the given directory, the
returned order will likely be
fastest.